LM of a thin section of grey cast iron

LM of a thin section of grey cast iron

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Credit: ASTRID & HANS FRIEDER MICHLER/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a thin section of a grey cast iron showing its excess carbon content in the form of graphite flakes (snake-like bands). The addition of carbon to iron makes steel, but when the carbon level increases beyond 4 percent, flakes such as these form and the steel is classed as cast iron. Cast iron is suitable for applications requiring bluk. The presence of high quantities of carbon makes the surface of castings hard and durable. The flakes aid damping against vibration during casting, facilitate machining and absorb shrinkage stresses as the castings solidify. Magnification: x250 at 6x4.5cm size.

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Keywords: alloy, carbon content of cast iron, cast iron, chemical, chemistry, compound, compounds, graphite flake, light micrograph

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